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When a humpback whale, Megaptera novaeangliae, exhales, the blow can exit the whale at 150 - 300 miles per hour.  The sea water on it's blowhole is vapourized and shot 20 to 25 feet into the air creating the ?blow?, or spout. On a calm day this can hang in the air for quite some time and makes the location of the whale visible from several miles away. Hawaii.